In this assignment, your goal is to implement an abstract data type (ADT) for a linked list. • The SLL class must implement an ILinkedListADT interface. • Each abstract method defined in the ILinkedListADT should be completely implemented, and any exceptions are to be appropriately propagated in the SLL class. • The Node class represents a node in the linked list. • Ensure that the linked list interface can perform the following functionality: o Prepend an item to the beginning of the linked list. o Append an item to the end of the linked list. o Remove an item at an index in the linked list. o Remove an item from the start of the linked list. o Remove an item from the end of the linked list. o Insert an item at a specific index in the linked list. o Replace an item in the linked list. o Get an item at an index in the linked list. o Get the index of an item in the linked list. o Check if the linked list has an item. o Clear all items in the linked list. o Get the number of items in the linked list. Important: Don’t use already implemented classes, methods or libraries (such as LinkedList). • Add at least one the following functionalities to the linked list: o Reverse the order of the nodes in the linked list. o Sort the nodes in the linked list into ascending order based on the names of the users. o Copy the values of the linked list nodes into an array. o Join two or more linked lists together to create a single linked list. o Divide the linked list into two separate linked lists based on a specific index position. Place the interface (ILinkedListADT), the implementing class (SLL) and the Node class in the utility folder mentioned in Table 1.   Unit Testing The LinkedListTest class is a test suite that performs unit testing on an implemented linked list. The following unit test cases will need to be implemented: • The linked list is empty. • An item is prepended. • An item is appended. • An item is inserted at index. • An item is replaced. • An item is deleted from beginning of list. • An item is deleted from end of list. • An item is deleted from middle of list. • An existing item is found and retrieved. • The additional functionality is working. Important: Some of the test cases have already been implemented. Do not modify the implemented test cases. Develop and implement any missing test cases to achieve the needed code coverage. Serialization • The objects in the linked list SLL must be serialized, and the SLL object must be stored in binary format. You must be able to reconstruct the object from its binary form. • Use the supplied SerializationTests class unit test cases to test for object serialization of the SLL. Note: Do not make any changes to the unit test suite. • All the unit test cases need to pass with no errors. The objects are serialized to memory in the unit test suite and, therefore, no changes are made on the hard drive. • Use the supplied User class in the ProblemDomain folder as the data type for the items in the linked list. Following the object-oriented principles, your project should contain ONLY the following classes and methods in their respective packages